The following is a list of all the changes made between the first and second printing. If you have the first printing you may want to make some of these changes as corrections. The list of errata for all versions also apply to the first printing.
Page 130. "Rumelhart, McClelland, et al., 1986" replaced by "Rumelhart, Hinton, and Williams".
Page 133. \s\ replaced by \z\ in the figure.
Page 148. "f(w)" replaced by "f(\xi)" (line -3).
Page 150. "actually" replaced by "actual" (line -7).
Page 157. "1/2" inserted into equations 6.85 and 6.86. "\gamma\eta/2" replaced by "\gamma\eta" (line -5).
Page 158. "\gamma\eta/2" replaced by "\gamma\eta" in equations 6.87 and 6.88.
Page 187. 3 signs changed on right-hand-side of equation 7.71. It should be of the form Y/tau - Sum - E(t).
Page 248. two "-" signs inserted into equation 9.40. It should be exp[-(xi-mu)...] in both numerator and denominator.
Page 283. "Rosenberg" to "Rosenfeld" in Barto et al (1983). "Rosenberg" to "Rosenfeld" in Bienenstock et al (1982).
Page 284. "Rosenberg" to "Rosenfeld" in Block (1962).
Page 285. "Rosenberg" to "Rosenfeld" in Cooper (1973).
Page 287. "Rosenberg" to "Rosenfeld" in Farhat et al (1985). "Rosenberg" to "Rosenfeld" in Feldman and Ballard (1982).
Page 288. "Rosenberg" to "Rosenfeld" in Fukushima et al (1983). "Rosenberg" to "Rosenfeld" in Geman and Geman (1984).
Page 289. "Rosenberg" to "Rosenfeld" in Grossberg (1976a). "Rosenberg" to "Rosenfeld" in Grossberg (1980).
Page 290. "Rosenberg" to "Rosenfeld" in Hebb (1949). In Hertz (1990), "Preprint..." replaced by "Statistical Dynamics of Learning. In Characterizing Complex Systems, ed. H. Bohr, 34-39. Singapore: World Scientific."
Page 291. "Rosenberg" to "Rosenfeld" in Hopfield (1982). "Rosenberg" to "Rosenfeld" in Hopfield (1984).
Page 293. "Rosenberg" to "Rosenfeld" in Kirkpatrick et al (1983). "Rosenberg" to "Rosenfeld" in Kohonen (1982).
Page 295. "International" to "Intl." in Lister (1990), to make room on page. "Rosenberg" to "Rosenfeld" in Little and Shaw (1975). "Rosenberg" to "Rosenfeld" in von der Malsburg (1973). Marr (1969) moved from top of page 296 to bottom of this page.
Page 296. Marr (1969) moved from top of this page to bottom of page 295. "Rosenberg" to "Rosenfeld" in Marr (1982). "Rosenberg" to "Rosenfeld" in Marr and Poggio (1976). "Rumelhart, McClelland" to "McClelland, Rumelhart" in McClelland and Elman. New entry: "McClelland, J.L., D.E. Rumelhart, and the PDP research group (1986). Parallel Distributed Processing: Explorations in the Microstructure of Cognition, Volume 2: Psychological and Biological Models. Cambridge: MIT Press.". "Rosenberg" to "Rosenfeld" in McCulloch and Pitts (1943).
Page 297. "Rosenberg" to "Rosenfeld" in Minsky and Papert (1969).
Page 301. "Rosenberg" to "Rosenfeld" in Rumelhart et al (1986a). "Rosenberg" to "Rosenfeld" in Rumelhart et al (1986b). "2 vols" to "Volume 1: Foundations" in Rumelhart et al (1986). In Saad and Marom (1990a), "Preprint ..." replaced by "Learning by Choice of Internal Representations--An Energy Minimization Approach. Complex Systems 4, 107-118.". In Saad and Marom (1990b), "Preprint ..." replaced by "Training Feed Forward Nets with Binary Weights via a Modified CHIR Algorithm. Complex Systems 4, 573-586.".
Page 302. "Rosenberg" to "Rosenfeld" in Sivilotti et al (1987).
Page 303. In Stockbro et al (1990), "Preprint ..." replaced by "Exploiting Neurons with Localized Receptive Fields to Learn Chaos. Complex Systems, 4, 603-622.".
Page 304. "Time Compression" to "Concentrating Information in Time" in 1st line.
Page 305. "Rosenberg" to "Rosenfeld" in Widrow and Hoff (1960).
Page 306. Headline corrected (version in first printing said "306 Bibliography APPENDIX"). "Rosenberg" to "Rosenfeld" in Willshaw et al (1969).
Page 324. Page 296 changed to 295-296 in Marr.
Page 327. Pages 115, 130 added to Williams.